When I first heard about PvP Worlds I was like "Oh wow, sounds cool, imagine the fights." others planned elaborate battles at various locations...they pondered on the possibilities of fights in meyerditch, white wolf, etc...but this never happened...SO here are some ideas for PvP worlds.

Make a few DIY worlds, you spawn randomly, have no bank, no items, and you get full drops from those you kill

Missions - You are teleported to a start location by a mission giver in some location (Fally castle safespot maybe?) you would have to retrieve items, go places, fight things, whatever...could work on DIY servers too...

Conquest: Max of 1-2 worlds P2P and same F2P ... Everyone is randomly assigned a team and you + your team have to try and conquer areas...Could be DIY with a shared team bank...possibly conquested towns could feed resources to bank?